Chevrolet isn't hiding the fact that a new rear-wheel-drive performance sedan – called the SS and seen in full checkered-flag regalia above – is on its way to US shores, courtesy of GM's Australian division. Past its eventual existence, though, we've been kept in the dark. How much will the SS cost? Who, exactly, will it be marketed to? And, perhaps most importantly, what will power the 2014 Chevy SS?

General Motors isn't set to begin producing the new Chevrolet SS until early next year, but the company has recently been spotted testing the model on U.S. streets. Our spy photographers managed to click a few photos of a heavily camouflaged version of the sedan before engineers spirited it back into the relative safety of the automaker's facilities. Even so, those on hand could easily hear the bark and snarl of an impressive V8 propelling the machine around. Odds are that's a naturally-aspirate